I fixed it today. I appreciate the suggestions. I think Scorch had the problem identified. The bolt has a protrusion that blocks the firing pin if the bolt does not go all the way forward. I cleaned it very thoroughly with brake cleaner then lubed with Triflow. After a couple of initial dry fires, the rest of the box fired like they were supposed to. I see why this shotgun design did not last. It seems overly complicated.
Best Regards.
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